Cadence Calls...only TX guy I know that cuts his own tone boards. Most guys are just using Echo polycarbonate inserts, which are great, but they all sound the same no matter the barrel.
I cut my own, well I did anyway. I was using a standard jig and filling it from there. It takes more wind than what I like. When I get back at it, I will make an upslope toneboard and get it to my liking. THen I will send it off to have a hardened steel jig made in replica of that tone board. That way I can repeat the process over and over with the same results.
For those interested Pintail sells a lot of duck call products. I have used them a lot with excellent customer satisfaction. Here is the custom jig
http://www.pintailwaterfowl.com/product-category/call-making-tools/